void setup() {
  // 串口监视器
Serial.begin(19200);
}

void loop() {
  // put your main code here, to run repeatedly:
Serial.println("输出");
if (Serial.available()>0) 
	{
		String data = Serial.readString();
    data.trim();
    if(data=="on")
    {

    }
	  
	}
}
